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Full Discussion: How to match 2 columns where one column has data as a range
Top Forums UNIX for Dummies Questions & Answers How to match 2 columns where one column has data as a range Post 302409943 by Franklin52 on Saturday 3rd of April 2010 08:19:39 AM
Old 04-03-2010
Quote:
Originally Posted by auburn
Beautiful! Works perfectly.
If you have time, would it be possible to post a few notes on what each line does? Just for learning...
Thank you!Smilie
Sure:

Code:
awk 'NR==FNR{a[$1]=$2;b[$1]=$3;c[$1]=$4;next}
a[$1] && $2 >= b[$1] && $2 <= c[$1]{print $0 FS a[$1];next}
{print $0 FS " -"}' file2 file1

Explanation:

Code:
NR==FNR

When we read the first file (file2)

Code:
{a[$1]=$2;b[$1]=$3;c[$1]=$4;next}

Fill the associative arrays a, b and c with the first field as index and get the next line of file2

Now:

a[$1] contains the 2nd field of file2
b[$1] contains the 3th field of file2
c[$1] contains the 4th field of file2

The code of the next line processes file1:

Code:
a[$1] && $2 >= b[$1] && $2 <= c[$1]{print $0 FS a[$1];next}

Code:
If the 1st field matches with an index of array a 
   and the 2nd column >= the 3th field of file2 
   and the 2nd column >= the 4th field of file2
then
   print the current row of file1, a fieldseparator, the 2nd field of file2 
   and get the next record of file1

Code:
{print $0 FS " -"}'

If the 1st field don't match with an index of array a print the line, a fieldseparator and " -"
 

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ppmtopgm(1)                                                   General Commands Manual                                                  ppmtopgm(1)

NAME

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SYNOPSIS

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DESCRIPTION

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